US President-elect Joe Biden has implored Americans to wear protective masks to combat the coronavirus pandemic, appealing to their patriotism, as he convened a task force to devise a blueprint for tackling the public health crisis.

"We could save tens of thousands of lives if everyone would just wear a mask for the next few months. Not Democratic or Republican lives. American lives," Mr Biden told reporters in Wilmington, Delaware.

"I implore you. Wear a mask. Do it for yourself. Do it for your neighbour. A mask is not a political statement."

The pandemic has killed more than 237,000 Americans and thrown millions out of work.

Mr Biden spoke two days after clinching election victory over Donald Trump, though the Republican president has not acknowledged defeat and is pursuing legal challenges to the results while making unfounded claims of fraud.

Mr Biden, set to take office on 20 January, conferred by video with his 13-member task force, headed by former US Surgeon General Vivek Murthy, former Food and Drug Administration Commissioner David Kessler and Yale University healthcare equity expert Marcella Nunez-Smith.

The president-elect labelled as "great news" Pfizer's announcement that its experimental Covid-19 vaccine was more than 90% effective.

But Mr Biden said it would be "many more months before there is widespread vaccination" in the United States and underscored the importance of wearing protective masks and social distancing.

The United States has been registering record high infection numbers in recent days.

Mask wearing has become a political issue in the United States, with Mr Trump mocking Mr Biden for wearing a mask during the campaign and many conservatives contending masks infringe upon their individual freedom.

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"The goal is to get back to normal as fast as possible," Mr Biden said. "And masks are critical in doing that. It won't be forever. But that's how we'll get our nation back up to speed economically, so we can go back to celebrating birthdays and holidays together, so we can attend sporting events together, so that we can get back to the lives and connections we shared before the pandemic."

Mr Biden during the campaign accused Mr Trump of panicking and surrendering to the pandemic.

Mr Trump promoted unproven medicines, assailed public health experts, failed to signal empathy or compassion as the death toll mounted and disregarded advice on mask wearing and social distancing, ending up hospitalised in October receiving treatments for Covid-19.

Housing Secretary Ben Carson has become the latest close Trump associate to test positive for the virus, his chief of staff said, just days after White House Chief of Staff Mark Meadows also tested positive.

Pfizer and German partner BioNTech are the first drug makers to release successful data from a large-scale clinical trial of a vaccine for the coronavirus.

Mr Biden said his team will focus on making rapid Covid-19 testing widely available and building a corps of contact-tracers to track and curb the pathogen's spread and prioritize vulnerable populations.

Mr Biden said his administration would work to get an approved vaccine "distributed as quickly as possible to as many Americans as possible, free of charge."

The task force will liaise with local and state officials to consider how to safely reopen schools and businesses and tackle racial disparities.

The Biden panel includes Rick Bright, a whistleblower who says he was removed from his Trump administration post for raising concerns about coronavirus preparedness, and Luciana Borio, who specializes in complex public health emergencies.

Vice President Mike Pence is due to meet the White House coronavirus task force for the first time since October.

Mr Biden cleared the threshold of 270 Electoral College votes needed to win the presidency on Saturday, four days after the 3 November election. He beat Mr Trump by more than 4.3 million votes nationwide, with Mr Trump becoming the first US president since 1992 to lose a re-election bid.